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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a023e0191083743dd93f446f150faa5c51c9b380291fa8dd373adfd512f612e' 
  AND token = '57p7HJmBE/0A4TOO/dDIbsQNLWcyjY4Uy6EayhpOBb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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