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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92612e3ca5589a68e8f44c5acd641b10ecbbf132432ce3ee0206779119c9f8b' 
  AND token = 'BEG22g1U0Iypr5GBy53e4zDAfoSe3DkZE4hsrJIO7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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