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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fbb2fc7335d3788e866da7508a0cdfdc317380ba50288a0ba0bb7c7bb94dde' 
  AND token = 'T2dtVi5c+KD6xCZ4Q7qDMNmf+FYt1z/MJ6ihzubBANs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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