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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564fd5ce0fca39cf7e158a6c86cc6e6db5d0751a5b2cc0ac63a4c4900242bbc6' 
  AND token = 'Wx3bV8nOazARbiM/TIcpYEbJiQUHCnGGNd+numFKjcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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