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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e167ced5ccac47ea29bc41b1c4f85c80531f81b5f8b1fbb0e6a990061c654b4' 
  AND token = 'Qfap8vqxwEsz1W3miknrjkJmoO38rlGLWSGDck/IZ28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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