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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51484ec735c9400502c4a7142a1dff5262cbee6951e2c6486499619ad4c524c' 
  AND token = '7tEolBnb0Hcwe8h6NuEtwYGilIcc+yy0+nlcoHWaQ/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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