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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70a6bc374898c656330f348615f4468ec843484102aed7e9a74cdfd37d47a2d' 
  AND token = 'ZIJ69PDnC7R6EJ+f5kXk/XdUKPktWIMMyXzjZS+HGC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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