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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee489722f6c90ad4560afb05d7bfe206828c243521f0855682dc6aebfcacc74e' 
  AND token = 'gPPeR/bfOOahooPzUn+p4mFV4VUN3YpIA3kL/wPvWzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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