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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01874ce7dc71990629ceb5d1cc6b571c994faaf31015155b9f33fc1a00cbdec0' 
  AND token = 'IygVPJ7PUOVQdMbg7nM9cYZZPqCurR1pvXH4QFCVH/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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