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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69dc6f3e7e50a9ba1804aa35b8f4a2af7c937ecc7a4edf056e536eba49c35d7' 
  AND token = 'EOmujWnb6xNTtto1g5Q30wnVqJ3yonvpwsmPoNeyGvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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