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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1ec26f6985928df7992de3734dfa1c73ba0839af24c9bad296378d877ae711' 
  AND token = 'EknYfPu0LNhIA/8ZK0/6+aiwK6ItHxKJK9+Pka4Xkaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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