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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6faf9e3574c31c28bd8f81d503fbfe7fd6ceba4b97978b4d97601a3070d887' 
  AND token = 'lqV9KrLlc4EIxrqJaF5zr2opLrFF2k2jwIvEHp55hDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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