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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c810c795fed3e1aea91f1847644659785fe37510c653476d1ee0eb677afce2b4' 
  AND token = 'Sw1pl4Gns0bTZvrmhPGN5d7y9QaQUzgr/G0j8TFXwkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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