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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7ab95ce26c058fc6c680222e81d9302bd9500b4a2878466befc0041448d431' 
  AND token = 'H1EwNh1mb1v+Tr3yao++568DPXVys3I65gq2VxVAh0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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