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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d6c6d23df0c5d1c5bac1a531f28a0f2fa7eac8f318f58b46060f3c76a8cd0b' 
  AND token = 'MyPRtGyDhGB8eSRLbZIaGhy1RVrhh6kPqq9HRPygYB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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