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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30b1c5a9e7b8777daf3ac74b1a252e01417ef4eec67b0fe876c17836f886557' 
  AND token = 'wjmCMUpsNa51GMFknmw7vOH4Li/jEFTXFurS2mvEkcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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