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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56aff570ebbb62d9d95e7ebebcd0d759baf842871ed721bc53f262b98fa13fb0' 
  AND token = 'eHxfx56LggTeG0NDlpbypn2SnjVNa3bJIAt6cjfS3nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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