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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f89e001520384ce79832b2a67a1098d4c5c0034cf08d5b38d6b2ec13a570cf' 
  AND token = 'rD/d5ujaw8ZXQGYZdabHTP4Oe8TaMKC0kg9i1uObqlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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