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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08215f04641f7892a39072a89fe15891418b72ba752f767a2d831b9f31d73d6e' 
  AND token = 'wSNMWCqypsSNdR4/kLEd5FDbkYI/Tyb6UvKoT7vyDvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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