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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a26e7350849cce91cd5db4d803baac2de81ca628b2d76736f64c963a6fc5bb' 
  AND token = 'RN4CB3WM9Jn/yhBpA1Yi0mZX3gg+kQS54wXvi7I29s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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