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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58312301d40146a214c4c1892954317c0e34b592911a389860252aacc9916e4d' 
  AND token = 'clrUmTQ7Q0oc0Zb6fdFQ//qe2Bb0IJEe6fNUM20MUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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