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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564a18ea61597fdff349fa218fd35d3a7592b3e90a222b72d5cf5d49f9afb4cb' 
  AND token = 'B2s7KfHA7V8fn78MyJq2oDSRWYwa+OMpAK1SeB7Ioek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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