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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e697e2b319a4045f1b99761d40bf9ac0103fbaa75461db3c65b77b5ee5ad101' 
  AND token = 'UfHxXXYIfYmuLlTuwxAiVm6nCw8gTX7IR46eP74NMPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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