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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973945cc2b64988f263026e5b19000a962088ed16e9d0e5240874da4cdb261fd' 
  AND token = 'u4aEGvKK3w8KL33S+yXdCMr275eUQLz8iTwSIsGqyb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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