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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31b61297a1a71ae55cecd172bbd00e4480dc530858139c901ca52c391922f41' 
  AND token = 'WAofOEs/40XswLVz5w1mz5FKfWzt5kv5ZoE2FAl72T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}