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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b8d83f46163988b0981efa7c83979288ddfd798a8c3640ba9fc2a3a1363893' 
  AND token = 'ihCFqDsiSeCw4eV7vmZplpuVQcLVXkZJrEGSx1Es1iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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