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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218fc8b7029fd880e06c95f573ce126a52c6e3afe4e9097ac108b758674b095a' 
  AND token = 'xDKPQVoR1ur4xnjCbjcxoi3DSNuK9sorDQ5659phD2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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