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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46fd80d9624764425ad6f434dfa67a349939eb19cba9a22e67cc82c0a1e4bf9' 
  AND token = '//aFHC0dojHgWg/D6voAwu32SUCbO8x8Fp4ZHCe5kmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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