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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3d0d1ce7f2775f51805bcc692d093d8c93eb3a1cfe734bafff59d3ea3d2fb1' 
  AND token = 'vuEmYh1ShSy0D/Gz/ckyJ8Dpjwrc5Y6e6ST6WK3Sxyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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