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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ce3f23e8592c8a48ffa127ec1eed9f0326016dcfb299ec0cd81f2e9ce1bdf5' 
  AND token = 'OkPGmvD88Dmxr1NzQIPTu6nVz1V2qvh8OnbJtR/mv+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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