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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e14c2ecf997589aec0201e3e16606a1a3c9ed540649fb0ecce0ef541e6189dc' 
  AND token = 'GIlV0Q1BV7WIcpVu78OMx4P/LxRvs1wIlHE892nyASU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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