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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bfc679308d9e4e554f6cd07a1370012e8f73ec33581e2d7ea8d8853e9dd977' 
  AND token = '8E45VlxVDPJ4UFIeU1VwR8PqctPsrz9bueZaDbEfQH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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