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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c2901837d98b1a012e7db6464414d0b9974a014bf708391b2ed23c73e34e68' 
  AND token = 'gxEyttcFYXgWUgNAUn73XF1w7+iPX1oo/5MWlIikMJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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