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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf52533f1aeb8150eef887c3a62f563edbd99f4f65c97f8fd55bad6ac66fa3a' 
  AND token = 'iWeggvMmeTuWl5bUQZ02BayE6ZSS2JypV6HV4Kj0E8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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