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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5845e61af88a5de73392f6ef4c1e54a7f82fd1f106b1f564c78a69d8a2ee9f' 
  AND token = 'ZHd6vuVCldqyVtdBl8o3WYtDSEwiublOXld9q0r37q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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