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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60743d6cbdf93ee10c76f34b5bb612c39f74b8c5828398ef31416400b7786f3a' 
  AND token = 'LxZlesTXYsZbCAb5bxpoMfcgg4ZB0HSrDtjRE1oFoqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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