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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa80102f44653bdf8731ca6c2871ef2335c35174894faf2c55c4f4220bec312' 
  AND token = 'zeJGFkeajj6nmSw0xRyS62nsQZxf+y+yjYoGzfrDit0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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