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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a94311aebc529a2919e9c8708c3ceb3e5f713ea4063b119ebba95a2189574fc' 
  AND token = '+7ECxTLb+U9yieQDVchF9Gk1ktf9zj/44OQbGfzGhW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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