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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcafe27a3af394388ae131241aec0ac64598d267f7c73b7e25e6574ced2d0fa' 
  AND token = '31CbgSi1yBTPCa1z/Rta8qseNh77DQ4xQBzvXU4+H4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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