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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9213a28acb576a7eebb960b88467d77b76102b79c09f941fdb1e81a2f435a48e' 
  AND token = 'LqAV5ElumR3WAxI0dBHTWeSvcPHHyvcJtXE7eqD4MRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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