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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a7552e761b216faceb3d8914654ebe4e68f234eba8abfe6230ee24a483029d' 
  AND token = 'B7wG8kJbfiEJx8emw6SU0o9bqk4szVyKSuqzI6h/cOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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