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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05eb90b40593b1b84c57fb1c26a8cdc1ef14924ae54e763fee5cc79c1e923cae' 
  AND token = 'qeAeNGqCGyeGJ3fu+kQ5attQVxqQwi49P5tE6wux4/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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