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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b495ac145eadd1010b34c183674d90e8257ce56be1f9704c29bd40259850d2d3' 
  AND token = '09Nx3R1fRJXvpRXAoB2yk0L59QP17E+XW3RnelzSy0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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