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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a70f3e4f3307164adc0317313cf6b625f331415544fd5273f096892fc15afe0' 
  AND token = 'sKZyA4R/VO9peCPP+bYTLY6YRFMdGP3gNb/deRfaA2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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