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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1de7c73944c761fb37bd0af96d6902455fe08f700f065d1a64ae827f5419ff' 
  AND token = 'A/1T723GO/HiIwE09OR+gbbXCv/aQ5TfyvbdqX40dMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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