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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00d145d91b438ed737e704f203ea510f27a469ada408478ab0b84525c6eef67' 
  AND token = 'PhvYTOywC7e2Vgd/qA42yNIaH10b+yvp486wrCHeXmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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